It is not dangerous, crypto industry is risky. It can become more safe if the scam projects will be less. I hope that it be very soon. Menlo.one is projects that can make it a reality.
I think that the crypto currency industry is dangerous for those people who do not think with their heads, but are chasing after big and easy prey. I know a person who, for the sake of investing in the crypto currency, eventually sold the house in 2017 and today he left with nothing.